Fire Alarm System

[YOUNG EE]

Hello All,

Currently have a Fire Alarm System design which has the Interposing Relay Cabinet (IRC) fed from the Annunciator Panel. (Annunciator Panel will act as the Power Supply)

However, after discussing with some colleagues they brought up why wont I have the IRC fed from the battery 24VDC from the FACU to minimize complications.

Could not locate anything within the code that argues on not utilizing the 24VDC from the FACU.

Therefore, please advise.

 

[gadfly56]

Hello All,

Currently have a Fire Alarm System design which has the Interposing Relay Cabinet (IRC) fed from the Annunciator Panel. (Annunciator Panel will act as the Power Supply)

However, after discussing with some colleagues they brought up why wont I have the IRC fed from the battery 24VDC from the FACU to minimize complications.

Could not locate anything within the code that argues on not utilizing the 24VDC from the FACU.

Therefore, please advise.

Annunciator panels are not usually designed to offer an auxiliary power output. Typically, they are supplied with a data pair and power pair from the FACU. I suppose it's possible to power the IRC's from the power cable by simply extending it, but I'd check with the FACU manufacturer to get their blessing for this arrangement. Most manufacturers will allow a separate listed power supply to fire up the annunciator, like an Altronix. You might do this if the annunciator is a fair distance from the FACU and voltage drop might be an issue. They are available with multiple outputs. You could put one to the annunciator and one to the IRC cabinet.